Which group elements are examples for Noble gases?

Which elements are examples of Noble gases?

Why are zero group elements called noble gases or inert gases?

(A) Group 18 elements are called noble gases (R) group 18 elements form only very few compounds

What are noble gases ?

The valency of noble gases is-

The second period element , for example , for example 'F' has less electron gain enthyalpy than the third period element of the same group of example'Cl' . Why ?

Are zero group elements and VIII group elements are same ?